Effects of crater development on fractionation and signal intensity during laser ablation inductively coupled plasma mass spectrometry
Effects of crater development on fractionation and signal intensity during laser ablation inductively coupled plasma mass spectrometry
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DOI：
10.1016/s0584-8547(00)00272-x
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发表时间：
2000-11-01
影响因子：
3.3
通讯作者：
Russo, RE
中科院分区：
文献类型：
--
作者：
Borisov, OV;Mao, XL;Russo, RE
这项工作介绍了凹坑发展对 ICP-MS 信号强度和元素分馏的影响。使用 1.0 mJ 脉冲重复 266 nm Nd/YAG 激光烧蚀后形成的凹坑具有圆锥形形状。激光烧蚀率（ng/s）取决于激光辐照度（单位时间和单位面积的激光脉冲能量），随着辐照度的增加而降低。相反，粒子夹带/传输效率并没有随辐照度的变化而显着变化。当凹坑纵横比（深度/直径）增加到某个阈值 6 以上时，Pb/U 元素比偏离化学计量值。然而，当仔细选择实验条件时，可以实现良好的烧蚀质量化学计量。火山口发展如何影响分馏的确切机制尚不清楚。在这项工作中，引入了实际辐照度而不是标称值。由于激光束采样的有效面积的变化，实际辐照度随着凹坑加深而降低。 (C) 2000 Elsevier Science B.V. 保留所有权利。
The effects of crater development on ICP-MS signal intensities and elemental fractionation have been presented in this work. Craters formed after repetitive 266-nm Nd/YAG laser ablation with 1.0-mJ pulses had a cone-like shape. The laser ablation rate (ng/s) depended on the laser irradiance (laser pulse energy per unit time and unit area), decreasing as irradiance increased. In contrast, the particle entrainment/transport efficiency did not significantly change with irradiance. As the crater-aspect ratio (depth/diameter) increased above some threshold value of six, the Pb/U elemental ratio departed from the stoichiometric value. However, good stoichiometry of ablated mass could be achieved when experimental conditions were carefully selected. The exact mechanism of how crater development affects fractionation is not well understood. In this work, actual irradiance was introduced instead of a nominal value. Actual irradiance decreased as the crater deepened due to changes of the effective area, sampled by the laser beam. (C) 2000 Elsevier Science B.V. All rights reserved.